Shim, Bum-Joo and Park, Kyoung-Suk and Koo, Jun-Mo and Jin, Seong-Ho (2012) Experimental study for analysis of down-speeding effect on fuel economy of HSDI diesel engine for NEDC. International Journal of Automotive Technology . ISSN 1229-9138 (Submitted)

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Abstract

Statutory requirements to reduce CO2 from tail pipes and strong interest in global environmental protection drove the main goal of modern HSDI diesel engines towards low fuel consumption. Two of the main strands of the criteria for low fuel consumption of modern diesel engine development are down-sizing and down-speeding. Down-sizing is well known for movement of the engine operation area in the direction of higher-loads, and thus better thermal efficiency is available. But this may cause degraded vehicle dynamic performance because of reduced back up torque as well as increased NOx. The down-speeding method aims to move engine operation area to higher load and lower engine speed. By this method degraded vehicle dynamic performance can be minimized with tangible fuel economy benefits. This study analyzed the characteristics of down-speeding relating to engine operation conditions and the fuel economy effect broken down by sector during the NEDC. Engine friction work, thermal loss through exhaust gas, thermal loss through fuel leakage and coolant, intake and exhaust pumping loss were compared and analyzed through the vehicle test.

Item Type:	Article
Additional Information:	Statutory requirements to reduce CO2 from tail pipes and strong interest in global environmental protection drove the main goal of modern HSDI diesel engines towards low fuel consumption. Two of the main strands of the criteria for low fuel consumption of modern diesel engine development are down-sizing and down-speeding. Down-sizing is well known for movement of the engine operation area in the direction of higher-loads, and thus better thermal efficiency is available. But this may cause degraded vehicle dynamic performance because of reduced back up torque as well as increased NOx. The down-speeding method aims to move engine operation area to higher load and lower engine speed. By this method degraded vehicle dynamic performance can be minimized with tangible fuel economy benefits. This study analyzed the characteristics of down-speeding relating to engine operation conditions and the fuel economy effect broken down by sector during the NEDC. Engine friction work, thermal loss through exhaust gas, thermal loss through fuel leakage and coolant, intake and exhaust pumping loss were compared and analyzed through the vehicle test.
Keywords:	Down-sizing, Down-speeding, Thermal Loss, NEDC(New European Driving Cycle), Friction Work, Indicated Work
Subjects:	H Engineering > H330 Automotive Engineering H Engineering > H311 Thermodynamics
Divisions:	College of Sciences > Faculty of Science > Lincoln School of Engineering
Depositing User:	Seong-Ho Jin
Date Deposited:	04 Dec 2012 18:40
Last Modified:	04 Dec 2012 18:40
URI:	http://eprints.lincoln.ac.uk/id/eprint/7007

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